20210921, 14:53  #980 
Sep 2011
Germany
2×1,489 Posts 
26*578^1998861 found by [AF>Belgique] melektha (552073 digits)

20210922, 21:07  #981 
Dec 2011
After milion nines:)
5C8_{16} Posts 
Why many old CRUS primes are again on Top 5000 page?

20210922, 22:19  #982 
May 2007
Kansas; USA
2^{3}·5·263 Posts 
To clarify: They are only showing on the status page.
Reason: They were changed to an Anonymous person. Last fiddled with by gd_barnes on 20210922 at 22:24 
20210922, 23:33  #983 
"AMD YES!"
Jan 2020
Bellevue, WA
2^{3}·7 Posts 

20210923, 06:51  #984 
May 2007
Kansas; USA
2918_{16} Posts 
The people who found them did not wish to report them on the top5000 site so Reb had reported them as a generic SRBase person. This turned out not to work because it accumulated a lot of primes for the SRBase person. We were informed by Prof. Caldwell at the top5000 site that it was not fair to other individuals to have a "set" of anonymous individuals accumulated as one person for top5000 prime scoring purposes.
The "anonymous" person does not compete with other individuals for top5000 prime score. It is just ignored for person scoring purposes. This is standard procedure for large projects who have many people who don't want to mess with reporting primes to the top5000 site. Both PrimeGrid and RPS have proof codes for anonymous individuals and have used them extensively. This is the first time that CRUS has had one. 
20210924, 10:09  #985 
May 2007
Kansas; USA
2^{3}·5·263 Posts 
279*798^2357491 is prime!
R798 is now a 3k'er. 
20210925, 18:15  #986 
Sep 2011
Germany
2·1,489 Posts 
38*977^299737+1 found by whizbang (896184 digits)

20210928, 14:48  #987 
Sep 2011
Germany
2×1,489 Posts 
162*814^233173+1 found by whizbang (678682 digits)
196*814^263256+1 found by grcpool.com3 (766242 digits) 
20211001, 12:27  #988 
"Mark"
Apr 2003
Between here and the
6428_{10} Posts 
64*425^4678571 is prime. This prime clocks in at 1229712 digits and proves R425. Woohoo!!!

20211001, 19:27  #989 
May 2007
Kansas; USA
2^{3}·5·263 Posts 

20211001, 20:11  #990 
"Mark"
Apr 2003
Between here and the
14434_{8} Posts 
I got lucky, which I won't complain about. I just started testing the range about a week ago and since this k has a light weight, wasn't expecting to find a prime. The primality test took more than a day with LLR:
Base factorized as : 5^2*17 Base prime factor(s) taken : 5, 17 Starting N+1 prime test of 64*425^4678571 Using FMA3 FFT length 448K, Pass1=448, Pass2=1K, clm=4, a = 3 64*425^4678571 may be prime. Starting Lucas sequence... Using FMA3 FFT length 448K, Pass1=448, Pass2=1K, clm=4, P = 4 64*425^4678571 may be prime, trying to compute gcd's U((N+1)/17) is coprime to N! U((N+1)/5) is coprime to N! 64*425^4678571 is prime! (1229712 decimal digits, P = 4) Time : 108946.064 sec. This is compared to a PRP test for the previous candidate on the same CPU: 64*425^4677611 is not prime. RES64: AF05EBF82647AB5A. OLD64: 4C8B49ECEACF6D8D Time : 16277.097 sec. 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Report top5000 primes for all k<=1001  gd_barnes  No Prime Left Behind  1521  20211016 20:43 
Report top5000 primes for k=10033000  gd_barnes  No Prime Left Behind  688  20200424 07:31 
All top 5000 primes will have the same number of digits in 2014 ;)  Batalov  Conjectures 'R Us  10  20130329 01:29 
Twenty Oldest Primes on Top 5000 List  masser  Lounge  9  20080827 12:31 
get all the 5000 biggest primes above 100K digits  jasong  jasong  1  20070609 22:51 